中国铁道科学2017，Vol.38Issue(5)：93-99,7.DOI:10.3969/j.issn.1001-4632.2017.05.13
铁路车轮轮辋疲劳裂纹和踏面剥离掉块的微观伤损因素分析
Analysis of Micro Damage Factors of Shattered Rim and Tread Shelling of Railway Wheel
摘要
Abstract
There are three different sets,and twenty standard wheels which are with shattered rim and with tread shelling and noncondemnable damage wheel of average kilometrage of 300 000 in revenue service designated as a set of the same types of cars.They have been selected to systematically investigate the component and quantitative relationship of different types of non-metallic inclusions using ASPEX automatic scanning electron microscope system,which can scan a large range of metallographic specimen.The morphology and characteristics of shattered rim and tread shelling wheels have been observed and measured by scanning electron microscope and optical microscope to study the mechanism of shattered rim and tread shelling.Results indicate that an absolute majority of the non-metallic inclusions from wheels with shattered rim are brittle inclusions which are accounted for 85％ of the total inclusions,and the visible millimeter brittle oxide inclusions which belong to refractory materials or slag in smelting or pouring process existing in the crack initiation zone are the main reason to shattered rim.Moreover,the non-metallic inclusions are almost plastic inclusions which are accounted for 84％ and 93％ of the total inclusions respectively distinguished from tread shelling wheels and noncondemnable damage wheels.The failure reason of tread shelling wheels is a significant amount of plastic deformation layer thickness of which the average is about 1 mm and is approximately ten times than that of noncondemnable damage wheels.关键词
车轮轮辋/疲劳裂纹/车轮踏面/剥离掉块/非金属夹杂物/踏面塑性变形层Key words
Wheel rim/Fatigue crack/Wheel tread/Spalling/Non-metallic inclusion/Plastic deformation layer of tread分类
交通工程引用本文复制引用
丛韬,韩建民,张关震,吴斯,张澎湃..铁路车轮轮辋疲劳裂纹和踏面剥离掉块的微观伤损因素分析[J].中国铁道科学,2017,38(5):93-99,7.基金项目
国家自然科学基金资助项目(U1334204) （U1334204）
国家“九七三”计划项目(2015CB654805) （2015CB654805）
铁道部科技研究开发计划项目(2009J015) （2009J015）
中国铁路总公司科技研究开发计划项目(2014J004-I,Z2015-J001) （2014J004-I,Z2015-J001）
